Carburetor



&pt. 18 1923.

B. M. DAWSON CARBURETOR Filed July 12, 1918 2' Sheets-Sheet 1 CWOW I Sept. 18,1923. L4fi358 B. M. DAWSON CARBURETOR Filed July 12, 1918 2 Sheets-Sheet 2 amuemtoz Im m: /"l. Dan Jon atmvwtf assesse s, 1923. g i barren era-res BAYLIS DAWSON, *OIE" PAT BROOKLYN, NEW YORK; Assmnon cosoAn coon-roan, TRUSTEE; :01" NEW YORK N. Y.

'Y onnn-nnn'ronn Application filcd July 12,

' carburetingdevices suchas are employedin;

connection with internal c gines. V j

Among the objects of the invention are to provide means for increasing the efficiency of the carburetor; also to adapt it to operate, if desired, with'kerosene or other low grade fuel. l

The invention also resides in the provision of means for vaporizing or pre-heat- 7 ing the fuel; in the employment of a heated and gauze lined passagewayor other mechanism for assisting in breaking up the liquid fuel; in the utilization of the heat of the I combustion enexhaust gases for changing the liquid fuel} to vapor; in the provision of a vapor generating member whichcan be added to the regular parts of a c'arburetoras now formed; 30 andflin such other featuresof construction and arrangements and combinations offparts as will more fullyhereinafter-appear.

In the drawings: i Figure 1 is a vertical sectional view of a carburetor mechanism embodying my inventionj V Figure 2' is a top plan view of the struction shown in Figure 1;

Figure 3 is a side elevational view, partly in section, of a modified construction;

7' Figure 4 is a top plan view of the con struction shown inFigure 3;

Figure 5 is a fragmentary sectional view through a still further modification. I

Describing in detail the constructions shown in the drawings and referring first to the form disclosed in Figures 1 and 2, A designates the Venturi tube of a carburetor having an airinlet B, and an outlet passage Gfrom which the fuel and air pass to the engine manifold in the usual manner; Entering the restricted throat of the Venturi tube is a fuel nozzle D, through which fuel is supplied from the generating tube E leading from the supply chamber F. Com- 1918, Serial No; 244,552.

munication between the supply chamber and the generating tube E is preferably controlled'by a suitable shutoff, such as the needle valve G. 7

It will be noted in Figure 1 that'the generating tube E extends through a surroundingchamber H, which chamber has threaded openings adapted to receive a conduit I connected to the exhaust manifoldso that the heated products'of combustion from the engine are carried through the chamber H and surround the generating tube E throughout the greater portion of its length. In this manner the liquid fuel passing from" the float chamber F to the Venturi tube of the carburetor is subjected to thehigh heat of the exhaust gases.

To insure intimate contact of the liquid fuel passing through the generatingtube E with the heat conducting material, there by producing ready and uniform vaporizer tion, the generating tube E is preferably lined with layers of wire gauze or other cellular heat conducting material which, togetherwith the high heat to which the tube is subjected, will cause a breaking up or vaporizing of the liquid fuel before it passes into the V enturi tube and is mixed with the air, By this novel arrangement for preheating and vaporizing the liquid fuelit is possible where'my carburetor apparatus is,

' employed .to use kerosene or other low grade fuels, although the invention in its broader aspects is not limited to use with any particular kind or kinds of fuel.

In Figures 3 and 4 the attachment device is shown, this being an arrangement of parts which can be quickly and conveniently secured to previously formed carburetors, such as are now in use, and theliquid fuel preheated and vaporized in a manner similar to that described in connection with Figures 1 and 2. In detail this attachment device comprises a tube J which is lined with wire gauze J, the tube being located within a chamber K interposed in the pipe K through which the hot exhaust gases from the engine are conducted. The tube J is conneced at one end by a pipe L to the supply chamber L of the carburetor, communicaa tion between the tube J and the conduit L being controlled by a suitable valve mechanism, such as the needle valve M. The liquid fuel flowing through the conduit- .lJ and the tube J is subjected to the breaking up action of the Wire gauze which is heated to a high temperature by the exhaust gases passing over the tube J. The heated fuel then passes outward through a connection N to the discharge nozzle 0 Where it is mixed with the air passing from the port P through the venturi Q7 of the carburetor.

In attaching the device it is only necessary to fasten the fitting It carrying the nozzle 0 into the Wall of the carburetor and fasten the fitting L of the pipe L into the carburetor pipe L The fitting It supports the pipe K which forms the chamber IQ and the tube J is held in proper position in this chamber by means of the connections N and N,

In use the liquid fuel from the carburetor chamber L is fed through the pipe L to the interior of the, tube J Where it is subjected to the breaking up action of the gauze-like materialJ' and the heatof the exhaust gases passing throughthe chamber K. The va poriz'ed fuel is then discharged through the nozzle 0 intothe contracted portion of the Venturi tube ivhere it meets the air drawn in through the port P.

In the construction shown in Figure 5 the heat of the exhaust gases is also utilized for heating the mixing chamber. For this purpose the venturi T is located in a chamber T which is supplied With the hot exhaust.

heating both the fuel and the air independently of each other and just prior to the point Where they come into the mixing chamber, and also for heating the mixture of air and fuel; e V

In each of the various constructions above described the liquid fuel is passed through a heatedtube or channel having a substantially straight bore and is subjected not only to the heat, but also to the breaking up action of the lining formed of brass gauze or other suitable material. By this arrangetube, and a casing surrounding said tube and surrounding said fuel nozzle'having registering openings in Which the extremity of the venturi memberare engaged and having a transverse opening for the admission through said casing of a heating medium.

2. In a carubretona Venturi tube, a vapor generating member having a fuel nozzle discharging into the contracted portion of said tube, and a casingsurrounding said venturi member and having a lateral enlargement enclosing said generating member said casing having an inlet for a heating medium. 7 r V In testimony whereof I aflix my si nature.

BAYLIS M. Dawson. 

